A semiclassical theory is used to describe the emission of multiple electromagnetic harmonics in the terahertz (THz) regime due to coherent frequency-modulated Bloch oscillations in a superlattice driven by a strong THz field. A cutoff frequency to the harmonics linear in the applied THz field strength but independent of modulation frequency is predicted.
No takes yet. Share an insight, caveat, or question.
Feise et al. (1999) studied this question.